Release v1.2

NEW:

• Implemented new Stream command support (see #299);

• Reduce encode_command() cost about 60% (see #397);

FIX:

• Fix pipeline commands buffering was causing multiple sendto syscalls (see #464 and #473);

• Python 3.7 compatibility fixes (see #426);

• Fix typos in documentation (see #400);

• Fix INFO command result parsing (see #405);

• Fix bug in ConnectionsPool._drop_closed method (see #461);

MISC:

• Update dependencies versions;

• Multiple tests improvements;